@InProceedings{P16-1009,
  author = 	"Sennrich, Rico
		and Haddow, Barry
		and Birch, Alexandra",
  title = 	"Improving Neural Machine Translation Models with Monolingual Data",
  booktitle = 	"Proceedings of ACL",
  year = 	"2016"
}
@InProceedings{P16-1185,
  author = 	"Cheng, Yong
		and Xu, Wei
		and He, Zhongjun
		and He, Wei
		and Wu, Hua
		and Sun, Maosong
		and Liu, Yang",
  title = 	"Semi-Supervised Learning for Neural Machine Translation",
  booktitle = 	"Proceedings of ACL",
  year = 	"2016"
}
@InProceedings{D17-1158,
  author = 	"Domhan, Tobias
		and Hieber, Felix",
  title = 	"Using Target-side Monolingual Data for Neural Machine Translation through Multi-task Learning",
  booktitle = 	"Proceedings of EMNLP",
  year = 	"2017"
}
@InProceedings{W17-4715,
  author = 	"Currey, Anna
		and Miceli Barone, Antonio Valerio
		and Heafield, Kenneth",
  title = 	"Copied Monolingual Data Improves Low-Resource Neural Machine Translation",
  booktitle = 	"Proceedings of the Second Conference on Machine Translation",
  year = 	"2017"
}